Aegirine, also know as (Acmite) is a mineral, mainly sodium-ferric iron silicate, occurring in feldspathoid rocks in slender prismatic crystals. They can be striated with pointed terminations most commonly occurring in alkalic igneous rocks
Localities include: Mont Saint-Hilaire, Quebec, Canada; Kongsberg, Norway; Narsarssuk, Greenland; Kola Peninsula, Russia; Magnet Cove, Arkansas, US; Kenya; Scotland and Nigeria.